While wandering the miles of walkways at Upper Geyser Basin, we happened upon this cute little fella. At first we thought he was a chipmunk, but later learned that a defining difference between squirrels and chipmunks is that while both may have stripes, only the latter have stripes that extend onto the face. So this is a striped squirrel of some kind.

At any rate, while rodents are rarely considered big thinkers, this one seemed to be deep in thought...